function myajax(method,url,callback) { 
    var xmlhttp;
    if (window.XMLHttpRequest)
    {// code for IE7+, Firefox, Chrome, Opera, Safari
    xmlhttp=new XMLHttpRequest();
    }
    else
    {// code for IE6, IE5
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
    if (method === 'GET') {
        xmlhttp.open('GET', url,true)
        xmlhttp.send()
    } else if (method === 'POST') { 
        xmlhttp.open("POST",url,true);
        xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
        xmlhttp.send("fname=Bill&lname=Gates");
    }
    xmlhttp.onreadystatechange=function(){
    if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
        callback(xmlhttp.responseText)
        }
    }
    
}